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Groups > comp.lang.postscript > #2246
| From | ken <ken@spamcop.net> |
|---|---|
| Newsgroups | comp.lang.postscript |
| Subject | Re: . bbox of a set of glyphs |
| Date | 2015-05-04 08:50 +0100 |
| Message-ID | <MPG.2fb1352154c267489898f3@usenet.plus.net> (permalink) |
| References | <e960544e-41e2-4c87-bda4-dca56daf7c41@googlegroups.com> <fb3c69b4-2c5a-404a-acfa-dbf5a3e25765@googlegroups.com> |
In article <fb3c69b4-2c5a-404a-acfa-dbf5a3e25765@googlegroups.com>, jodun@mail.com says... > > I think I need to compute the *overall* bounding box > > But if I use the bbox device, I get an utterly wrong answer. > > > > Help Well, you still haven't opened a bug report..... Assuming the file below is an example of the sort of problem you are seeing, the problem is that the bbox device is limited (clipped) by the initial page. So if your output extends off the page, it will be clipped to it. > -------------------------------- code ---------------------- > > 0 setgray > > /Times-Bold 111 selectfont 200 444 moveto (Sun) show > /Arial 44 selectfont 60 rotate (Moon) show > 2 3 scale > /Courier-Italic 300 selectfont 45 rotate (Pluto)show > -----------------------------end code ----------------- > > Now, how can I get the overall/cumulative bounding box ? > and how to clip the margins out ? The Ghostscript bbox device (which is clipped to the page) says that the BBOX is 0 441 439 1301. The code supplied by jdaw1, again using Ghostscript, comes out at -404 398 383 1214, Acrobat Distiller says -420 396 385 1214 (Bear in mind the fonts used are probably slightly different since they are not embedded). I have no idea which is correct, I presume you know. However, if you accept the fact that the bbox device clips to the page, then these are all in reasonably close agreement, I certainly don't see the bbox device answer as 'utterly wrong'. So, I then modified the iput file to move the entire conetnt onto the page (and made the page size large enogh to hold the content. I did ths by modifying your code: %! <</PageSize [4000 4000]>> setpagedevice 1000 0 translate /Times-Bold 111 selectfont 200 444 moveto (Sun) show /Arial 44 selectfont 60 rotate (Moon) show 2 3 scale /Courier-Italic 300 selectfont 45 rotate (Pluto)show showpage Running this through the bbox device gives me: %%BoundingBox: 127 441 1439 2575 %%HiResBoundingBox: 127.964809 441.897737 1438.657550 2574.422078 So, the modified file has its lower left at 127,441 and its upper right at 1439,2575. As to clipping out the margins, you use 'rectclip'. Howeever, what I assume you *actually* mean is 'how do I draw this so it fills the page with no white space'. In which case the answer is that you set the PageSize to be the width and height, and translate the bottom left corner of the content to 0,0. So I modified your original file thus: %! <</PageSize [1312 2134]>> setpagedevice 873 -441 translate /Times-Bold 111 selectfont 200 444 moveto (Sun) show /Arial 44 selectfont 60 rotate (Moon) show 2 3 scale /Courier-Italic 300 selectfont 45 rotate (Pluto)show showpage So how did I arrive at those figures ? Easy, the width is given by urx - llx = 1439 - 127 = 1312. Heiht is given by ury - lly = 2575 - 441 = 2134. We know that when we offset the content by x=1000, y=0 that the content started at llx = 127, lly = 441. So we need to translate the content by that amount. 1000 - 127 = 873, and 0 -441 = -441. If I run this through Ghostscript then the result is ver close to a tight clip to the text. Differences in resolution, and rounding errors, will mean that there are always likely to be a few pixels difference. You can probably get even closer by using the high resolution bbox. For confirmation I ran the file through acrobat distiller and, given the caveats about fonts, the result is close to the Ghostscript display. In any event, the Ghostscript bbox device's result is certainly not 'utterly wrong', and gives a result better than that proposed by use of charpath. Ken
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. bbox of a set of glyphs jodun@mail.com - 2015-04-30 15:05 -0700
Re: . bbox of a set of glyphs ken <ken@spamcop.net> - 2015-05-01 07:48 +0100
Re: . bbox of a set of glyphs jdaw1 <jdawiseman@gmail.com> - 2015-05-01 01:50 -0700
Re: . bbox of a set of glyphs jodun@mail.com - 2015-05-02 06:48 -0700
Re: . bbox of a set of glyphs jdaw1 <jdawiseman@gmail.com> - 2015-05-02 14:13 -0700
Re: . bbox of a set of glyphs ken <ken@spamcop.net> - 2015-05-04 08:00 +0100
Re: . bbox of a set of glyphs jdaw1 <jdawiseman@gmail.com> - 2015-05-08 01:34 -0700
Re: . bbox of a set of glyphs ken <ken@spamcop.net> - 2015-05-08 10:44 +0100
Re: . bbox of a set of glyphs jdaw1 <jdawiseman@gmail.com> - 2015-05-08 05:06 -0700
Re: . bbox of a set of glyphs SaGS <sags5495@gmail.com> - 2015-05-11 01:40 -0700
Re: . bbox of a set of glyphs jdaw1 <jdawiseman@gmail.com> - 2015-05-11 02:58 -0700
Re: . bbox of a set of glyphs ken <ken@spamcop.net> - 2015-05-04 08:50 +0100
Re: . bbox of a set of glyphs jodun@mail.com - 2015-05-04 11:22 -0700
Re: . bbox of a set of glyphs jodun@mail.com - 2015-05-07 14:01 -0700
Re: . bbox of a set of glyphs luser- -droog <mijoryx@yahoo.com> - 2015-05-07 21:19 -0700
Re: . bbox of a set of glyphs ken <ken@spamcop.net> - 2015-05-08 08:21 +0100
Re: . bbox of a set of glyphs ken <ken@spamcop.net> - 2015-05-08 12:06 +0100
Re: . bbox of a set of glyphs jodun@mail.com - 2015-05-12 07:44 -0700
Re: . bbox of a set of glyphs ken <ken@spamcop.net> - 2015-05-12 16:36 +0100
Re: . bbox of a set of glyphs jodun@mail.com - 2015-05-14 08:18 -0700
Re: . bbox of a set of glyphs ken <ken@spamcop.net> - 2015-05-14 17:31 +0100
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